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OrcKey.java
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91 lines (78 loc) · 2.41 KB
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.orc.mapred;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.JobConfigurable;
import org.apache.orc.OrcConf;
import org.apache.orc.TypeDescription;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
/**
* This type provides a wrapper for OrcStruct so that it can be sent through
* the MapReduce shuffle as a key.
* <p>
* The user should set the JobConf with orc.mapred.key.type with the type
* string of the type.
*/
public final class OrcKey
implements WritableComparable<OrcKey>, JobConfigurable {
public WritableComparable key;
public OrcKey(WritableComparable key) {
this.key = key;
}
public OrcKey() {
key = null;
}
@Override
public void write(DataOutput dataOutput) throws IOException {
key.write(dataOutput);
}
@Override
public void readFields(DataInput dataInput) throws IOException {
key.readFields(dataInput);
}
@Override
public void configure(JobConf conf) {
if (key == null) {
TypeDescription schema =
TypeDescription.fromString(OrcConf.MAPRED_SHUFFLE_KEY_SCHEMA
.getString(conf));
key = OrcStruct.createValue(schema);
}
}
@Override
public int compareTo(OrcKey o) {
return key.compareTo(o.key);
}
@Override
public boolean equals(Object o) {
if (o == null || key == null) {
return false;
} else if (o.getClass() != getClass()) {
return false;
} else {
return key.equals(((OrcKey) o).key);
}
}
@Override
public int hashCode() {
return key.hashCode();
}
}